Hey dipenkp,
Thanks for the question. I understand that you have changed your Apple ID and password and are now experiencing some issues with iCloud on your iPhone. The following resource may provide a solution:
Apple ID: What to do after you change your Apple ID
http://support.apple.com/kb/HT5796
iCloud
iOS 6 and later: Go to Settings > iCloud.
- If you signed out before changing your Apple ID, enter your current Apple ID to sign in. The data from your iCloud account will download to your device.
- If you're still signed in with your previous Apple ID:
1. Scroll down and tap Delete Account. Depending on what iCloud options are turned on, you'll be asked to confirm that you want to delete data from your device. To confirm, tap Delete. (If you're using iOS 7 and have Find My iPhone turned on, you'll be asked to enter the password for your previous Apple ID. Enter the password, then tap Turn Off.) The data will be deleted from your device, but not from iCloud.
2. Enter your current Apple ID to sign in. The data from your iCloud account will download again to your device.
Thanks,
Matt M.